Distinguishing and positioning method and system for underwater weak target

Abstract

The invention provides a distinguishing method and system for an underwater weak target. The method comprises the steps that firstly, strong disturbing signals in a stop band are filtered out from receiving signals of a multi-sensor array through a spatial matrix filter, wherein the spatial matrix filter meets the condition that the pass-band response error is smallest under the constraint condition of a stop-band overall response error; then based on the receiving signals with the strong disturbing signals filtered out, the underwater target is positioned through a matched processor. The basic thought of the method is that the receiving array signals pass through the spatial matrix filter, a spatial matrix filter technology is used for the receiving array signals, the strong disturbing signals in the stop band can be effectively filtered out on the premise of ensuring that pass-band target signals pass through without distortion, and therefore influence on the detection and positioning of the pass-band target signals is eliminated, the underwater target is positioned through a conventional matched processor or an adaptive matched processor, and positioning of the underwater weak target is achieved under the condition of strong disturbance on the water surface.

Description

technical field [0001] The invention relates to the field of sonar digital signal processing, in particular to a method and system for distinguishing and positioning underwater weak targets. Background technique [0002] The underwater acoustic signal processing technology based on the multi-sensor array can realize the azimuth, distance and depth estimation of the target, and the technologies used are mainly beamforming technology and matching field processing technology. Since matching field processing can realize target depth and distance estimation, this technology has important application value in judging target type and threat degree. The widely used matching field processors are linear matching processor and adaptive matching processor. The theoretical research based on these two processor algorithms has been sufficient, and its processing performance has also been fully demonstrated through simulation and actual sea experiment data. . Because the possible location...

AI Technical Summary

Problems solved by technology

However, the existing equipment with spatial filtering needs to be solved with the help of third-party optimization software, which has a huge amount of calculation and cannot meet the real-time requirements of the system and the large aperture of the system receiving array.

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